1970 D Washington Quarter

Hello Everyone,
Looking for some info on a coin I found the other day. I’ve looked online and it appears to be similar to others that r said to hv the clad layer missing, but I’m new to this coin collecting thing so would appreciate all the help I can get! Will try to get a better pick soon.

Missing clad layer would be on one side. It would weigh less, and the copper would look like this members coin. It is a textbook example, but that makes it easier to see the difference. The other side of this coin is your normal silver color. Environmental damage is just a dirty rusted coin on both sides, and generally has been buried in the ground for a time and then recovered.